That isn't true. There are versions of 9.2.x, 9.3.x etc that are vulnerable per the documentation. 9.1.7 is the only firmware released before this was announced

That isn't true. There are versions of 9.2.x, 9.3.x etc that are vulnerable per the documentation. 9.1.7 is the only firmware released before this was announced (jan 18th) that contains a fix. Every other software version is vulnerable and requires an upgrade.